Correlation between the quality indicators of activated coal in vodka technology

Abstract

Introduction. The purpose of the publication is to establish correlation relations between the quality indicators of active coal (AC) used in the distillery production in vodka technology. Materials and methods. AC of natural origin, which is used for distillery production. Standard methods of determination and quantitative characteristics of AC quality indicators. Mathematical-statistical methods of research are linear correlation analysis based on the Pearson correlation coefficient. Results and discussion. It was found that the correlation coefficient (r) between iodine adsorption activity (Ai.), which characterizes the amount and volume of micropore AC with diameter Dm<2 nm, including nanopor with diameter Dm<1 nm, and methylene blue (Am.b.), which depends on the mesopore volume with a diameter Dme=2…50 nm, is equal to 0.93. The total volume of the micro-and mesoporous space determines the total sorption capacity of AC relative to the organic impurities present in the water-alcohol mixtures. AC's sorption activity also depends on its fractional composition. The correlation (reverse dependence) between adsorption activity on acetic acid (Aa.a.) and the mass fraction of the sorbent residue on a screen with a cloth №10 (F№10) with a coefficient r=-0,94 was established. Reducing the mass fraction of the residual on a screen with a cloth from 97…98% to 62…64% leads to an increase in adsorption activity of AС by acetic acid to 117 ml versus 62 ml. This is directly due to the fact that the residual sorbent on the sieve № 10 has a large area of the surface of the microporous and mesoporous space due to the reduced size of the grains. The total volume of sorbents in water (Tp.v.) is directly proportional to the mass fraction of water soluble ash (Mw.a.) r=0.92 and the mass fraction of moisture (Mm.) at r=0.99. In order to release AC from water soluble ashes and increase the volume of pore space, it will be logical to wash the prepared AC with water and then dry it to the water content in the coal to 2%. It was established that the fractional composition, the mass of the residue on the sieve with canvas № 36 (F№36) is directly dependent on the mass fraction of ash (Ma.) (r=0.91) and the mass fraction of water soluble ash (Mw.a.) (r=0.91), which indirectly indicates the influence of inorganic components AC on its mechanical strength. It is assumed that in the largest fractions of AC with a mass of the residue on the sieve with canvas № 36 (F№36=2.1%) contains more ash in the macropore space (Ma=5.12%), including water soluble ash (Mw. a.=1.95%). Conclusions. As a result of the analysis of standard quality indicators AB and the study of their mutual dependencies using the mathematicalstatistical method using the Pearson correlation coefficients, it has been found that 92% (12 out of 13) indicators have strong internal relationships that are characterized by a "very high" correlation force with coefficients r=0.90-0.99.